I think Jang Ri In has the storngest and most powerful voice out of all of the choices. ...Sorry, no offense to fans, but I don't really like Boa's voice.. it's a little annoying to listen to. and Dana has an AWESOME VOICE, too! she's part of CSJH (the Grace).... which is the only girl group I listen to cause they can actually sing. ....and jessica???? is that supposed to be jessica jung from SNSD?? cause sorry.. but she sucks. ok wait. no let me rephrase... she's not THAT bad, BUT WHEN COMPARED to DANA and Jang Ri In.. and even BoA I guess, she definitely sucks.